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this should help
The 1415 MHz receiver used a parametric amplifier, cooled with liquid nitrogen. System noise temperature was 120 Kelvin, the bandwidth was 8 MHz, and the integration time was typically 12 seconds, with an RMS noise of .025 Kelvin. Antenna efficiency was 40% to 50%. Sources were identified down to .25 Janskys (a measure of radio power). Beam resolution at 1415 MHz was 8 to 10 arc minutes in right ascension by 40 arc minutes in declination
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